Discussions By Condition: I cannot get a diagnosis.

urgent need some answers

last month after my period i had two shots of liquor, the very next day i noticed while going to the bathroom i felt a burning and a constant urge to go. the burning and having to go sensation went away in a week or so, then i started spotting. my spotting was very light, it really wasnt enough to wear a pad. my spotting lasted for about 3 weeks. i had gone to the ER they did urine samples, and ultrasounds and they said they didnt know what the cause was, and that its prob nothing serious? and this month comes along and i dont get my period?? should i really go back in to get checked up or have i waited too long? the only reason why i'm debating this is because i have no medical insurance.